Submersible multi-stage centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, and provides a submersible multi-stage centrifugal pump which comprises a plurality of shells, each shell is provided with a first impeller groove and a second impeller groove, the first impeller groove and the second impeller groove of another adjacent shell form an installation cavity, the groove wall of the first impeller groove or the second impeller groove is provided with a turbulent flow groove, and the turbulent flow grooves are communicated with the installation cavity. And the impeller is rotationally arranged in the mounting cavity. By means of the technical scheme, the problems that an impeller of a multi-stage centrifugal pump in the prior art is short in service life and prone to damage are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a submersible multi-stage centrifugal pump. Background Art

[0002] In the field of centrifugal pumps, especially in the application of submersible multi-stage centrifugal pumps, high requirements are placed on pump performance and stability. Traditional multi-stage centrifugal pumps have many problems in the liquid transmission process. When the impeller rotates at high speed and throws out the liquid, vortices with a rotating direction and energy are formed. If left untreated, these vortices will have many adverse effects on the liquid inlet of the next stage impeller, such as uneven liquid inlet, excessive or insufficient liquid in some areas, affecting the operating efficiency and stability of the impeller; the vortexing liquid will irregularly impact the impeller, causing energy loss and vibration, reducing the overall efficiency of the pump and affecting the life of the impeller; and the bubbles entrained in the vortexing liquid can easily cause cavitation and damage the impeller. Therefore, an innovative design is needed to improve these conditions and enhance the performance, stability and service life of the pump. Utility Model Content

[0003] The utility model provides a submersible multi-stage centrifugal pump, which solves the problems of short impeller life and easy damage of the multi-stage centrifugal pump in the related art.

[0004] The technical solution of the utility model is as follows:

[0005] A submersible multistage centrifugal pump comprising

[0006] A housing, wherein the housing is multiple, the housing having a first impeller groove and a second impeller groove, the first impeller groove and the second impeller groove of another adjacent housing forming a mounting cavity, the groove wall of the first impeller groove or the second impeller groove having a spoiler groove,

[0007] An impeller is rotatably arranged in the installation cavity.

[0008] As a further technical solution, the housing has a clearance hole, and the impeller includes

[0009] The installation shaft is coaxially arranged with the clearance hole, and the installation shaft is connected in sequence.

[0010] A blisk is disposed on the mounting shaft.

[0011] As a further technical solution, the impeller includes:

[0012] A first blade disc and a second blade disc, a flow groove is provided between the first blade disc and the second blade disc, a high-pressure chamber is formed between the first blade disc and the adjacent shell, the spoiler groove is located in the high-pressure chamber, a channel is formed between the second blade disc and the mounting shaft, a pressure chamber is formed between the second blade disc and the shell, the pressure chamber leads to the channel, the channel leads to the flow groove, one end of the flow groove leads to the high-pressure chamber, and the high-pressure chamber leads to the next-level pressure chamber.

[0013] As a further technical solution, the mounting shaft has a cavity, the mounting shaft has a large head end and a small head end, the cavity is located on one side of the large head end and has an insertion hole, the cavity is located on the small head end and has a mounting hole, and the insertion hole is used to insert the small head end of another adjacent impeller.

[0014] As a further technical solution, the spoiler grooves are arranged in a plurality of circles, the cross section of the spoiler grooves gradually expands from one end to the other end, and the direction of expansion of the spoiler groove cross section is opposite to the direction of rotation of the impeller.

[0015] As a further technical solution, the diameter of the second blade disk is slightly larger than that of the first blade disk.

[0016] As a further technical solution, the first impeller is of a conical type.

[0017] As a further technical solution, there is a gap between the second blade disk and the adjacent shell.

[0018] As a further technical solution, it also includes

[0019] A driving shaft is passed through the plurality of mounting holes in sequence, and the impeller is key-connected to the driving shaft.

[0020] As a further technical solution, it also includes

[0021] The driving shaft is arranged on the output end of the rotating driving member.

[0022] The working principle and beneficial effects of the utility model are as follows:

[0023] In the present invention, a submersible multi-stage centrifugal pump is mainly composed of a plurality of casings. Each casing is provided with a first impeller groove and a second impeller groove. The first impeller groove and the second impeller groove of two adjacent casings can be combined to form a mounting cavity. The groove wall of the first impeller groove or the second impeller groove also has a spoiler groove. The impeller is rotatably arranged in the mounting cavity. When the impeller rotates at high speed to throw out the liquid, the liquid will form vortices with a certain rotation direction and energy. If these vortices are not handled, they will have an adverse effect on the liquid intake of the next stage impeller. The spoiler groove is located on the groove wall of the first impeller groove or the second impeller groove, and its position is just right to contact the liquid thrown out by the impeller. When the liquid with vortex flows through the spoiler groove, the structure of the spoiler groove will interfere with the flow path of the liquid and break the original vortex state of the liquid. In this way, the flow of the liquid becomes more uniform and stable, providing more suitable liquid intake conditions for the next stage impeller. Ensure uniform liquid flow into the next impeller: Unturbated swirling liquid can cause over- or underflow in certain areas of the next impeller, impacting the impeller's efficiency and stability. Turbine grooves disrupt vortices, evenly distributing the liquid at the inlet to the next impeller, ensuring a relatively even supply to all parts of the impeller and improving the impeller's efficiency and performance stability. Swirling liquid can impact the next impeller in an irregular pattern, causing energy loss and impeller vibration. Turbine grooves stabilize the liquid flow before it enters the next impeller, minimizing this impact and energy loss, thereby improving overall pump efficiency and extending impeller life. In a multi-stage centrifugal pump, the operating conditions of each impeller stage influence each other. Turbine grooves ensure optimal liquid flow conditions at each impeller stage, helping to maintain stable head and flow output throughout the entire pump. This prevents performance fluctuations caused by poor liquid flow to a particular impeller stage, improving pump reliability and stability. Swirling liquid can carry air bubbles, which can easily cause cavitation when entering the next impeller stage, potentially damaging the impeller. After the spoiler groove destroys the vortex, the bubbles can be more evenly dispersed in the liquid or discharged, reducing the possibility of cavitation, improving the pump's anti-cavitation ability, and further extending the service life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0025] Figure 1 This is a schematic diagram of the structure of the utility model;

[0026] Figure 2 It is a partial structural diagram of the utility model;

[0027] Figure 3 This is a schematic structural diagram of the housing in the present invention;

[0028] Figure 4 It is a cross-sectional schematic diagram of part of the structure of the utility model;

[0029] Figure 5 This is a schematic diagram of the impeller structure of the utility model;

[0030] Figure 6 This is a schematic cross-sectional structural diagram of the impeller in the present invention.

[0031] In the figure: casing 1, first impeller groove 101, second impeller groove 102, mounting cavity 103, spoiler groove 104, clearance hole 105, gap 106, impeller 2, mounting shaft 201, blade disk 202, first blade disk 203, second blade disk 204, flow groove 205, high-pressure cavity 206, channel 207, pressure cavity 208, cavity 209, large end 210, small end 211, insertion hole 212, mounting hole 213, drive shaft 3, rotating drive member 4. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0033] To simplify the drawings, only the parts relevant to the utility model are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0034] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0035] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] Reference Figures 1 to 6 , which is the first embodiment of the utility model, proposes a submersible multi-stage centrifugal pump, including a housing 1, there are several housings 1, the housing 1 has a first impeller groove 101 and a second impeller groove 102, the first impeller groove 101 and the second impeller groove 102 of another adjacent housing 1 form a mounting cavity 103, the groove wall of the first impeller groove 101 or the second impeller groove 102 has a spoiler groove 104, and the impeller 2 is rotatably arranged in the mounting cavity 103.

[0037] In this embodiment, a submersible multi-stage impeller 2 centrifugal pump is primarily composed of a plurality of housings 1. Each housing 1 is provided with a first impeller groove 101 and a second impeller groove 102. The first impeller grooves 101 and second impeller grooves 102 of two adjacent housings 1 can be combined to form a mounting cavity 103. A spoiler groove 104 is also provided on the groove wall of the first impeller groove 101 or the second impeller groove 102. The impeller 2 is rotatably disposed within the mounting cavity 103. When the impeller 2 rotates at high speed to eject liquid, the liquid forms vortices with a specific rotational direction and energy. If these vortices are not addressed, they can adversely affect the liquid intake of the next-stage impeller 2. The spoiler groove 104 is located on the groove wall of the first impeller groove 101 or the second impeller groove 102, precisely positioned to contact the liquid ejected by the impeller 2. When the vortex-carrying liquid flows through the spoiler groove 104, the structure of the spoiler groove 104 interferes with the liquid's flow path, disrupting the liquid's original vortex state. In this way, the flow of liquid becomes more uniform and stable, providing more suitable liquid inlet conditions for the next-stage impeller 2. Ensure that the liquid enters the next-stage impeller 2 evenly: vortex liquid that has not been treated with turbulence will cause too much or too little liquid to enter some areas of the next-stage impeller 2, thereby affecting the working efficiency and stability of the impeller 2. After the vortex is destroyed by the turbulence groove 104, the liquid can be evenly distributed at the entrance to the next-stage impeller 2, ensuring that all parts of the impeller 2 can obtain a relatively uniform liquid supply, improving the working efficiency and performance stability of the impeller 2. The vortex liquid will impact the next-stage impeller 2 in an irregular manner, causing energy loss and vibration of the impeller 2. The turbulence groove 104 allows the liquid to enter the next-stage impeller 2 smoothly, reducing this impact and energy loss, which is beneficial to improving the overall efficiency of the pump and extending the service life of the impeller 2. In a multi-stage impeller 2 centrifugal pump, the working conditions of the impellers 2 at each stage affect each other. The turbulence groove 104 ensures that each stage of the impeller 2 has good liquid inlet conditions, which helps the entire pump maintain a stable head and flow output during operation. This prevents performance fluctuations caused by poor liquid inflow to a particular impeller 2 stage, improving the pump's operational reliability and stability. Swirling liquid can carry bubbles, which can easily cause cavitation when entering the next-stage impeller 2, damaging it. By disrupting the vortex, the spoiler grooves 104 disperse the bubbles more evenly in the liquid or expel them, reducing the likelihood of cavitation, improving the pump's anti-cavitation capabilities, and further extending its service life.

[0038] Furthermore, the housing 1 has a clearance hole 105 , and the impeller 2 includes a mounting shaft 201 , which is coaxially arranged with the clearance hole 105 . The mounting shaft 201 is composed of several mounting shafts 201 connected in sequence, and the blade disk 202 is arranged on the mounting shaft 201 .

[0039] In this embodiment, the design of connecting multiple mounting shafts 201 in sequence is one of the key structures for realizing a multi-stage impeller 2 centrifugal pump. In this way, multiple impellers 2 can be installed in the pump body in a certain order and spacing to form a multi-stage impeller 2 structure. Each stage of impeller 2 can pressurize the liquid, thereby gradually increasing the pump head and pressure to meet the requirements for liquid transportation under different working conditions. In application scenarios that require a higher head, such as pumping water from a deep well or supplying water to a high-rise building, the impeller 2 connected by the multi-stage mounting shaft 201 can lift the water to the required height through multi-stage pressurization, overcoming the problem of limited head of the single-stage impeller 2.

[0040] The mounting shaft 201 is coaxially arranged with the clearance hole 105 on the housing 1. This design is crucial to the operational stability of the pump. The guarantee of coaxiality enables the impeller 2 to maintain its center position unchanged during rotation, reducing vibration and friction caused by eccentricity. The reduction of vibration can not only reduce the noise of the equipment, but also extend the service life of the pump and reduce the wear of components. The impeller 202 is the main working component of the impeller 2, which is mounted on the mounting shaft 201. When the mounting shaft 201 drives the impeller 202 to rotate, the blades of the impeller 202 exert force on the liquid, causing the liquid to gain kinetic energy and pressure energy. The shape of the impeller 202 and the design of the blades directly affect the performance of the pump. A reasonable design of the impeller 202 can effectively accelerate and pressurize the liquid in the impeller 2, thereby improving the flow rate and head of the pump.

[0041] The sequential connection of the mounting shaft 201 and the combined design of the impeller 202 and the mounting shaft 201 exhibit certain modular characteristics. This modular structure facilitates the removal and replacement of components during pump maintenance. If a fault occurs in an impeller 2 or mounting shaft 201, it can be removed individually for repair or replacement without requiring extensive disassembly of the entire pump body. This not only shortens maintenance time and costs but also improves the maintainability and availability of the equipment. Furthermore, the modular design facilitates upgrades and improvements to the pump's performance, allowing performance improvements to be achieved simply by replacing the corresponding modules.

[0042] The coaxial arrangement of the clearance hole 105 and the mounting shaft 201 in the housing 1 facilitates the installation of the pump. During installation, the relative positioning and installation of the impeller 2 and the housing 1 can be achieved simply by accurately inserting the mounting shaft 201 into the clearance hole 105. This simple installation method reduces the need for adjustment and calibration during installation, improves installation efficiency, and reduces installation difficulty. This simple installation method is particularly important for applications with limited on-site installation conditions, such as installing a pump in a narrow well or underground pump room. It saves installation time and labor costs, ensuring that the pump can be quickly and accurately installed and put into normal operation.

[0043] Furthermore, the impeller 2 includes a first blade disc 203 and a second blade disc 204, a flow groove 205 is provided between the first blade disc 203 and the second blade disc 204, a high-pressure chamber 206 is formed between the first blade disc 203 and the adjacent shell 1, the spoiler groove 104 is located in the high-pressure chamber 206, a channel 207 is formed between the second blade disc 204 and the mounting shaft 201, a pressure chamber 208 is formed between the second blade disc 204 and the shell 1, the pressure chamber 208 leads to the channel 207, the channel 207 leads to the flow groove 205, one end of the flow groove 205 leads to the high-pressure chamber 206, and the high-pressure chamber 206 leads to the next-level pressure chamber 208.

[0044] In this embodiment, a flow groove 205 is located between the first blade disc 203 and the second blade disc 204. A high-pressure chamber 206 is formed between the first blade disc 203 and the adjacent housing 1, and the flow-disrupting groove 104 is located within the high-pressure chamber 206. A channel 207 is formed between the second blade disc 204 and the mounting shaft 201, and a pressure chamber 208 is formed between the second blade disc 204 and the housing 1. The pressure chamber 208 communicates with the channel 207, which in turn leads to the flow groove 205. One end of the flow groove 205 leads to the high-pressure chamber 206, which in turn leads to the next-level pressure chamber 208. The flow groove 205 plays a key role in guiding liquid flow. When the impeller 2 rotates, the liquid is ejected from the impeller 2 under the action of centrifugal force. The flow groove 205 provides a specific flow path for the ejected liquid, allowing the liquid to flow orderly from one area to another. It ensures that the flow of liquid within the impeller 2 is not turbulent, thereby improving the efficiency and stability of the liquid flow. During the operation of the pump, the liquid ejected from the second impeller 204 can flow smoothly to the high-pressure chamber 206 through the flow groove 205, realizing the continuous circulation and pressurization process of the liquid. The presence of the flow groove 205 helps to balance the pressure distribution in different areas inside the impeller 2. By rationally designing the shape and size of the flow groove 205, the pressure of the liquid can gradually change during the flow process, avoiding the situation where the local pressure is too high or too low. This is very important for improving the working efficiency of the impeller 2 and reducing energy loss. When the liquid enters the flow groove 205 from the pressure chamber 208 through the channel 207, the flow groove 205 can evenly distribute the pressure to the entire flow groove 205 area, and then transport the liquid to the high-pressure chamber 206 for further pressurization, thereby ensuring the stable operation of the pump.

[0045] The high-pressure chamber 206 is an important area for increasing the pressure of the liquid. In the high-pressure chamber 206 formed by the first blade disc 203 and the adjacent shell 1, as the liquid is continuously thrown into the high-pressure chamber 206 during the rotation of the impeller 2, the pressure in the chamber gradually increases. The existence of the high-pressure chamber 206 provides a concentrated pressurized space for the liquid, allowing the liquid to obtain higher pressure energy. The spoiler groove 104 is located in the high-pressure chamber 206. In addition to destroying the vortex to ensure the liquid inflow to the next-stage impeller 2, it may also have a certain regulating effect on the liquid flow and pressure distribution in the high-pressure chamber 206, further optimizing the pressurization effect of the high-pressure chamber 206. The high-pressure liquid in the high-pressure chamber 206 has a tendency to flow toward the pump outlet. During the entire working process of the pump, the high-pressure chamber 206 plays the role of an intermediate transition, temporarily storing the liquid pressurized by the impeller 2 and further increasing the pressure, and then pushing the liquid to flow toward the outlet of the pump, realizing the liquid delivery function.

[0046] The presence of pressure chamber 208 allows the liquid to transition within a relatively stable space, ensuring a certain pressure base when the liquid enters the subsequent flow channel, thereby improving the operating efficiency of the entire pump. Pressure chamber 208 is connected to the flow groove 205 and the channel 207 between the second impeller 204 and the mounting shaft 201 through channel 207, forming a complete liquid flow circuit. It works in conjunction with components such as the flow groove 205 and the high-pressure chamber 206 to achieve an orderly flow of liquid and a pressure increase process within the impeller 2. Pressure changes in pressure chamber 208 affect the liquid flow rate and pressure distribution within channel 207 and the flow groove 205, thereby affecting the performance of the entire pump.

[0047] The design of components such as flow channel 205, high-pressure chamber 206, pressure chamber 208, and channel 207 helps balance the pressure distribution within impeller 2. This prevents vibration, deformation, or damage to impeller 2 caused by localized excessive or insufficient pressure, thereby improving the operational stability and reliability of the pump. Stable pressure distribution also reduces wear on internal pump components, extending the pump's service life and reducing maintenance costs and downtime.

[0048] The internal structural design of impeller 2 enables the pump to adapt to varying operating conditions to a certain extent. When the liquid flow rate or pressure changes, the pump automatically adjusts the liquid flow state and pressure distribution through the regulatory action of components such as flow channel 205 and channel 207, maintaining relatively stable operating performance. This adaptability makes the submersible multi-stage impeller 2 centrifugal pump more reliable in actual applications, reducing the risk of failure and downtime caused by fluctuating operating conditions.

[0049] Furthermore, the mounting shaft 201 has a cavity 209, and the mounting shaft 201 has a large head end 210 and a small head end 211. The cavity 209 is located on one side of the large head end 210 and has an insertion hole 212. The cavity 209 is located on the small head end 211 and has a mounting hole 213. The insertion hole 212 is used for inserting the small head end 211 of another adjacent impeller 2.

[0050] In this embodiment, the design of the insertion hole 212 and the mounting hole 213 enables adjacent impellers 2 to be easily connected. The small end 211 of one impeller 2 is inserted into the insertion hole 212 of the large end 210 of another impeller 2, thereby realizing the sequential connection of the multi-stage impellers 2. This connection method is not only simple and reliable, but also can ensure the accurate axial positioning of the impeller 2, ensuring the relative position of the impeller 2 is stable during the operation of the pump. Accurate positioning helps to make the impellers 2 fit more closely and improve the working efficiency and stability of the pump. For example, when rotating at high speed, no axial displacement will occur between adjacent impellers 2, thereby avoiding problems such as liquid leakage, energy loss or equipment damage caused by the misalignment of the impeller 2.

[0051] The structure of the mounting shaft 201 with the cavity 209 can enhance the strength and stability of the mounting shaft 201 to a certain extent. The presence of the cavity 209 can make the mounting shaft 201 have better bending and torsion resistance when bearing the rotational force of the impeller 2 and the pressure of the liquid. At the same time, the design of the large end 210 and the small end 211 of the mounting shaft 201 can also make the stress distribution more uniform, reduce local stress concentration, and extend the service life of the mounting shaft 201. The strength and stability of the mounting shaft 201 are crucial to the operational reliability of the entire pump. A stable mounting shaft 201 can ensure the smooth rotation of the impeller 2, reduce vibration and noise, and improve the working efficiency and safety of the pump.

[0052] Furthermore, the spoiler grooves 104 are arranged in a plurality of circles, and the cross section of the spoiler grooves 104 gradually expands from one end to the other end, and the direction in which the cross section of the spoiler grooves 104 expands is opposite to the rotation direction of the impeller 2 .

[0053] In this embodiment, multiple circumferentially arranged flow-disrupting grooves 104 can more comprehensively disrupt the liquid ejected by impeller 2. When impeller 2 rotates at high speed, the liquid is ejected under the action of centrifugal force. These flow-disrupting grooves 104 can disrupt the liquid vortex at different locations, ensuring that the liquid enters the next-stage impeller 2 more evenly. The circumferential arrangement provides a wider range of flow-disrupting effects, improving control over liquid flow and thus optimizing pump performance.

[0054] The design of the spoiler groove 104 cross-section gradually expanding from one end to the other helps to guide the flow direction of the liquid and reduce turbulence and instability factors of the liquid during the flow. As the cross-section expands, the flow rate of the liquid will gradually decrease and the pressure will gradually increase, making the flow of the liquid smoother. This stable flow state is very important for improving the efficiency of the pump and reducing energy loss. It can reduce the impact of the liquid on the internal components of the pump and extend the service life of the equipment. The direction of expansion of the spoiler groove 104 cross-section is opposite to the direction of rotation of the impeller 2. This design can better utilize the rotational power of the impeller 2. When the impeller 2 rotates, the liquid is thrown out to the surroundings under the action of centrifugal force, and the reverse expansion of the spoiler groove 104 cross-section can produce a certain resistance to the liquid, causing the flow speed and direction of the liquid to change, thereby more effectively destroying the vortex.

[0055] Furthermore, the diameter of the second blade disk 204 is slightly larger than that of the first blade disk 203 .

[0056] In this embodiment, the second blade disc 204 with a larger diameter can change the flow path and velocity distribution of the liquid to a certain extent. When the impeller 2 rotates, the liquid first passes through the second blade disc 204. Due to its larger diameter, it can generate a greater centrifugal force on the liquid, allowing the liquid to obtain a higher initial velocity. The liquid enters the flow groove 205 between the first blade disc 203 and the second blade disc 204. Since the diameter of the first blade disc 203 is smaller, the flow rate of the liquid in the flow groove 205 will further increase, thereby increasing the kinetic energy and pressure energy of the liquid. This design helps to optimize the flow of liquid inside the impeller 2 and improve the performance of the pump. The larger diameter of the second blade disc 204 means that it can push more liquid per unit time, thereby increasing the flow rate of the liquid. At the same time, the larger diameter also makes the second blade disc 204 more capable of doing work on the liquid and can provide a higher pressure for the liquid.

[0057] After the liquid passes through the second blade disk 204 and enters the pressure chamber 208, its pressure is initially increased. The liquid then flows through the channel 207 into the flow channel 205 and the high-pressure chamber 206. During this process, the pressure of the liquid is further increased due to the diameter difference between the first blade disk 203 and the second blade disk 204 and other structural factors, achieving a multi-stage pressurization effect.

[0058] Furthermore, the first impeller 2 is of a conical type.

[0059] In this embodiment, the design of the conical impeller 2 has good adaptability to fluids of different properties. Whether it is clean water, sewage or a medium containing solid particles, the conical impeller 2 can effectively transport them, reducing wear and clogging of the impeller 2 by the medium.

[0060] Furthermore, a gap 106 is defined between the second blade disk 204 and the adjacent casing 1 .

[0061] In this embodiment, the presence of gap 106 prevents direct contact between second blisk 204 and housing 1, thereby reducing friction and wear. During pump operation, impeller 2 rotates at high speed. Without gap 106 between blisk 202 and housing 1, friction between them would generate significant heat, reducing pump efficiency and potentially damaging blisk 202 and housing 1. Properly providing gap 106 reduces the coefficient of friction, minimizes energy loss, and extends the service life of blisk 202 and housing 1.

[0062] During pump operation, blisk 202 and casing 1 may experience thermal expansion and mechanical deformation due to temperature fluctuations and mechanical stress. Without gap 106 between blisk 202 and casing 1, these deformations could cause interference between the two, potentially damaging pump components. The presence of gap 106 allows blisk 202 and casing 1 to expand and deform freely within a certain range without interfering with each other. This helps improve pump reliability and stability, reducing failures caused by thermal expansion and mechanical deformation.

[0063] Furthermore, it also includes a drive shaft 3, which passes through the mounting holes 213 in sequence, and the impeller 2 is key-connected to the drive shaft 3.

[0064] In this embodiment, drive shaft 3 is a key component for transmitting power from the motor to impeller 2. The motor's rotational motion is transmitted to impeller 2 via drive shaft 3, enabling high-speed rotation of impeller 2, thereby pressurizing and conveying the liquid. Drive shaft 3 must have sufficient strength and rigidity to withstand the rotational force of impeller 2 and the reaction force of the liquid, while ensuring efficient power transmission.

[0065] The key connection is a reliable connection method that can ensure that the relative position between the impeller 2 and the drive shaft 3 is fixed while transmitting power. The presence of the key can prevent the impeller 2 from sliding or rotating on the drive shaft 3, ensuring that the rotation of the impeller 2 is synchronized with the rotation of the drive shaft 3. The key connection also has the advantage of easy installation and disassembly. When the impeller 2 needs to be repaired or replaced, the impeller 2 can be easily removed from the drive shaft 3 by removing the key without causing damage to the drive shaft 3. The key connection can keep the impeller 2 stable during high-speed rotation. Due to the action of the key, the connection between the impeller 2 and the drive shaft 3 is tight and will not loosen or shake, thereby reducing the generation of vibration and noise.

[0066] Furthermore, a rotation driving member 4 is included, and the driving shaft 3 is arranged on the output end of the rotation driving member 4 .

[0067] In this embodiment, the rotary drive 4 is the power core of the entire pump, providing the necessary rotational power for the centrifugal pump's operation. It converts electrical, mechanical, or other forms of energy into the rotational motion of the drive shaft 3, thereby rotating the impeller 2 and achieving liquid delivery. Different types of rotary drive 4 have different characteristics and applications. For example, electric drives offer advantages such as high efficiency, reliability, and ease of control, making them suitable for most applications. Hydraulic drives, on the other hand, are suitable for applications requiring high power output or specialized working environments.

[0068] The rotating drive element 4 controls the pump's operating state by adjusting its output speed and torque. By varying the speed of the drive element, the pump's flow rate and head can be adjusted to meet the needs of different operating conditions. The drive element also provides functions such as overload protection and start and stop control to ensure safe and stable operation of the pump. In applications requiring precise flow control, a variable frequency drive element 4 can be used to achieve stepless regulation of the pump's flow rate by adjusting the motor frequency.

[0069] The rotary drive element 4 works closely with the drive shaft 3, impeller 2, and other components to form the power transmission system of the submersible multi-stage impeller 2 centrifugal pump. The output end of the drive element connects to the drive shaft 3, transmitting power to the impeller 2, enabling its high-speed rotation. The installation position and method of the drive element also need to be considered in conjunction with the other pump components to ensure a compact structure and stable operation.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A submersible multistage centrifugal pump, characterized in that: include A housing (1), wherein the housing (1) is a plurality of housings, the housing (1) having a first impeller groove (101) and a second impeller groove (102), the first impeller groove (101) and the second impeller groove (102) of another adjacent housing (1) forming a mounting cavity (103), the groove wall of the first impeller groove (101) or the second impeller groove (102) having a spoiler groove (104), An impeller (2), the impeller (2) being rotatably disposed in the mounting cavity (103).

2. A submersible multistage centrifugal pump according to claim 1, characterized in that: The housing (1) has a clearance hole (105), and the impeller (2) includes The mounting shaft (201) is coaxially arranged with the clearance hole (105), and the mounting shaft (201) is connected in sequence in a plurality of ways. A blade disk (202), wherein the blade disk (202) is arranged on the mounting shaft (201).

3. A submersible multistage centrifugal pump according to claim 2, characterized in that: The impeller (2) comprises A first blade disk (203) and a second blade disk (204), a flow groove (205) is provided between the first blade disk (203) and the second blade disk (204), a high-pressure chamber (206) is formed between the first blade disk (203) and the adjacent shell (1), the spoiler groove (104) is located in the high-pressure chamber (206), a channel (207) is formed between the second blade disk (204) and the mounting shaft (201), a pressure chamber (208) is formed between the second blade disk (204) and the shell (1), the pressure chamber (208) leads to the channel (207), the channel (207) leads to the flow groove (205), one end of the flow groove (205) leads to the high-pressure chamber (206), and the high-pressure chamber (206) leads to the next-level pressure chamber (208).

4. A submersible multistage centrifugal pump according to claim 2, characterized in that: The mounting shaft (201) has a cavity (209), the mounting shaft (201) has a large end (210) and a small end (211), the cavity (209) is located on one side of the large end (210) and has an insertion hole (212), the cavity (209) is located on the small end (211) and has a mounting hole (213), and the insertion hole (212) is used for inserting the small end (211) of another adjacent impeller (2).

5. The submersible multistage centrifugal pump according to claim 1, characterized in that: The spoiler grooves (104) are arranged in a plurality of circles, and the cross section of the spoiler grooves (104) gradually expands from one end to the other end, and the direction in which the cross section of the spoiler grooves (104) expands is opposite to the direction in which the impeller (2) rotates.

6. A submersible multistage centrifugal pump according to claim 3, characterized in that: The second blade disk (204) has a larger diameter than the first blade disk (203).

7. A submersible multistage centrifugal pump according to claim 3, characterized in that: The first impeller (2) is of a conical type.

8. The submersible multistage centrifugal pump according to claim 3, characterized in that: There is a gap (106) between the second blade disk (204) and the adjacent housing (1).

9. The submersible multistage centrifugal pump according to claim 4, characterized in that: Also includes A drive shaft (3), the drive shaft (3) sequentially passes through the plurality of mounting holes (213), and the impeller (2) is key-connected to the drive shaft (3).

10. The submersible multistage centrifugal pump according to claim 9, characterized in that: Also includes A rotary drive member (4), wherein the drive shaft (3) is arranged on an output end of the rotary drive member (4).

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